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Communication: Infrared spectroscopy of salt-water complexes.

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journal contribution
posted on 2016-11-17, 11:00 authored by Jon Tandy, Cheng Feng, Adrian Boatwright, Gautam Sarma, Ahmed M. Sadoon, Andrew Shirley, Natercia Das Neves Rodrigues, Ethan M. Cunningham, Shengfu Yang, Andrew M. Ellis
To explore how the ion-pair in a single salt molecule evolves with the addition of water, infrared (IR) spectra of complexes composed of NaCl and multiple water molecules have been recorded for the first time. The NaCl(H2O)n complexes were formed and probed in liquid helium nanodroplets, and IR spectra were recorded for n = 1 → 4. The spectra for n = 1, 2, and 3 are consistent with formation of the lowest energy contact-ion pair structures in which each water molecule forms a single ionic hydrogen bond to an intact Na(+)Cl(-) ion-pair. Alternative structures with hydrogen bonding between water molecules become energetically competitive for n = 4, and the IR spectrum indicates likely the coexistence of at least two isomers.

Funding

The authors wish to thank the UK Engineering and Physical Sciences Research Council (EPSRC, Grant No. EP/J021342/1) and the Leverhulme Trust (Grant No. RPG-2012-740) for grants in support of this work.

History

Citation

Journal of Chemical Physics, 144, 121103 (2016)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Chemistry

Version

  • VoR (Version of Record)

Published in

Journal of Chemical Physics

Publisher

AIP Publishing

issn

0021-9606

eissn

1089-7690

Acceptance date

2016-03-30

Available date

2017-03-30

Publisher version

http://scitation.aip.org/content/aip/journal/jcp/144/12/10.1063/1.4945342

Language

en

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